Abstract: It is the object of the present invention to provide a binder resin for coating paste, comprising a polyvinyl acetal type resin, having an excellent dispersibility of inorganic powder such as conductive powder, ceramic powder and glass powder and being capable of exerting an extremely excellent coating property, particularly a printing property, when dispersing the inorganic powder to form paste, conductive paste, ceramic paste and glass paste. in the formulas, R1 represents a straight chain or branched alkyl group having 1 to 20 carbon atoms, and R2 represents hydrogen, a straight chain, branched or cyclic alkyl group having 1 to 20 carbon atoms, or an aryl group; and n represents an integer of 1 to 8; and further in the modified polyvinyl acetal resin, a content of the structural unit represented by the general formula (3) is 1 to 20 mol % and a content of the structural unit represented by the general formula (4) is 30 to 78 mol %.

Abstract: It is the object of the present invention to provide a binder resin for coating paste, comprising a polyvinyl acetal type resin, having an excellent dispersibility of inorganic powder such as conductive powder, ceramic powder and glass powder and being capable of exerting an extremely excellent coating property, particularly a printing property, when dispersing the inorganic powder to form paste, conductive paste, ceramic paste and glass paste. The present invention is a binder resin for coating paste for forming a film or a film pattern comprising inorganic powder by coating, which comprises a modified polyvinyl acetal resin comprising structural units represented by the following general formulas (1), (2), (3) and (4): [Chem.

Abstract: A heat transfer sheet comprises a substrate sheet and a heat transfer layer laminated on the substrate sheet and containing a dye which can be caused to migrate by heating to be transferred onto a transferable sheet, said heat transfer sheet containing a polyvinyl acetacetal resin as a binder component, the acetal moiety of said polyvinyl acetacetal resin being 50% by weight or more based on the total amount of the resin, and 80% by weight or more of said acetal moiety comprising polyvinyl acetacetal.A process for producing a polyvinyl acetacetal resin by the reaction of a polyvinyl alcohol and acetaldehyde in an aqueous phase in the presence of 4 to 10% by weight of an acid catalyst comprises initiating precipitation of an acetalated product by maintaining the reaction system at a temperature of 8.degree. to 17.degree. C. for 30 minutes or longer, and then maintaining said reaction at a temperature of 25.degree. to 40.degree. C.

Abstract: A heat transfer sheet comprises a substrate sheet and a heat transfer layer laminated on the substrate sheet and containing a dye which can be caused to migrate by heating to be transferred onto a transferable sheet, said heat transfer sheet containing a polyvinyl acetacetal resin as a binder component, the acetal moiety of said polyvinyl acetacetal resin being 50% by weight or more based on the total amount of the resin, and 80% by weight or more of said acetal moiety comprising polyvinyl acetacetal.A process for producing a polyvinyl acetacetal resin by the reaction of a polyvinyl alcohol and acetaldehyde in an aqueous phase in the presence of 4 to 10% by weight of an acid catalyst comprises initiating precipitation of an acetalated product by maintaining the reaction system at a temperature of 8.degree. to 17.degree. C. for 30 minutes or longer, and then maintaining said reaction at a temperature of 25.degree. to 40.degree. C.